website: bump postcss from 8.4.33 to 8.4.34 in /website (#8430)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.33 to 8.4.34.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.33...8.4.34)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/package.json

@@ -25,7 +25,7 @@
         "@mdx-js/react": "^3.0.0",
         "clsx": "^2.1.0",
         "disqus-react": "^1.1.5",
-        "postcss": "^8.4.33",
+        "postcss": "^8.4.34",
         "prism-react-renderer": "^2.3.1",
         "rapidoc": "^9.3.4",
         "react-before-after-slider-component": "^1.1.8",